Question

the first strands of dna were observed through which microscope?
tunneling microscope
simple microscope
compound light microscope
electron microscope

Explanation:

DNA strands are extremely small. Simple microscopes and compound light microscopes use light and have limited magnification power. Tunneling microscopes are used for different purposes (e.g., observing surfaces at the atomic scale in a different context). Electron microscopes use electrons instead of light and have much higher magnification capabilities, which is necessary to observe the very small DNA strands.

Answer:

electron microscope